不锈钢基/β-PbO2-TiO2-Co3O4复合镀层制备及其性能表征

使用直流复合电沉积方法制备不锈钢基β-PbO2、TiO2掺杂β-PbO2、Co3O4掺杂β-PbO2、TiO2和Co3O4共掺杂β-PbO2复合镀层材料.采用SEM、EDS、XRD和电化学测试等对复合电极进行形貌、成分、组成和催化活性表征,并且将不锈钢基/β-PbO2-TiO2-Co3O4电极应用到锌电积实验中.结果表明,添加Co3O4能提高PbO2电极的催化活性;添加TiO2可以起到细化晶粒,增大比表面积的作用;不锈钢基β-PbO2-TiO2-Co3O4复合镀层阳极与Pb-Ag合金阳极相比,锌电积槽电压降低为2.97V,电流效率提高到91.2％,使用寿命延长.     

Synthesis of Caffeic Acid Sulphonamide Derivatives and Preliminary Exploration of Their Biological Applications

Structural modification of native compounds is an effective way to develop new drugs with increased pharmacological activities and improved material characteristics. In this study, caffeic acid sulphonamide derivatives(CSs) were synthesised by conjugating sulphonamides to the backbone of caffeic acid. The structures of these derivatives were elucidated by means of Fourier transform infrared spectroscopy(FTIR), ¹H NMR, ¹³C NMR, and electrospray ionization mass spectroscopy(ESI-MS). A content determination method was established by ultraviolet detection. The lipophilicity, 2,2-diphenyl-1-picrylhydrazy free radical(DPPH) scavenging capacity, anti-coagulant effects, anti-bacterial activity, cytotoxicity, in vitro anti-proliferative activity against tumour cells, and the ability of the compounds to promote the proliferation of chondrocytes were evaluated. The results indicate that CSs exhibit strong DPPH scavenging activity, high lipophilicity, good anti-coagulant activities, wide anti-bacterial activity range, low cytotoxicity, and an excellent ability to promote chondrocyte proliferation.     

电沉积Al/Pb-Ag阳极在电积锌过程中的耐腐蚀性

采用电沉积的方法在甲基磺酸镀液中制备了一种新型的锌电积Al/Pb-0.23%Ag阳极。 腐蚀实验和电化学分析显示,Al/Pb-0.23％Ag阳极与传统Pb-0.25％Ag阳极相比,具有较低的腐蚀速率,较高的腐蚀电位和较低的腐蚀电流密度,较高的电催化活性;金相显微镜、扫描电子显微镜和X射线衍射分析显示,Al/Pb-0.23％Ag阳极的晶粒细小、致密,极化48 h后有PbSO4、α-PbO2和β-PbO2生成。     

红外标准加入法测定复合植物生长剂中三十烷醇的含量

采用红外标准加入法,测定复合植物生长剂中三十烷醇的含量。样品经处理后,在提取的三十烷醇中加入系列标准品,制成溴化钾片,测定含量。该法平均回收率97.3%,测量变异系数2.5%。     

气相色谱和气相色谱/质谱法分析高级脂肪伯醇混合物的化学组分

多廿醇是从制糖滤泥中分离得到的一种高级脂肪伯醇天然混合物,其化学组成分析未见报道。本文采用气相色谱法（GC）和气相色谱／质谱法（GC／MS）,对其组分和结构进行了分析和鉴定。     

马山前胡挥发油化学成分研究

本文用毛细管气相色谱、气相色谱／质谱／计算、气相色谱／红外光谱等现代仪器分析技术，对马山前胡挥发油的化学成分进行了分析研究，从毛细管色谱分离出８０多个峰，确认了其中３７种成分，占色谱总馏出峰面积的９７％以上，该挥发油的主要化学成分为蒎烯。     

Al/Pb-0.2%Ag阳极在氟离子和硫酸体系中的电化学行为

为了研究铝基铅银合金阳极在含氟离子和硫酸的体系中电化学行为,对含银0.2%的铝基铅银合金阳极(Al/Pb-0.2%Ag)分别在不同氟离子(F^-)和硫酸浓度下进行循环伏安测试和恒电流极化曲线进行了测试。 结果表明,F^-浓度升高时,对阳极表面单质铅氧化成二价铅以及二价铅氧化成四价铅有抑制作用,对四价铅还原为二价铅有抑制作用,但是对二价铅还原为单质铅有促进作用;此时析氧反应受阻,氧化成膜反应将被促进;硫酸浓度升高时,阳极上面铅的氧化和还原程度均先增大后减小;硫酸浓度为20 g/L、F^-浓度0.1 g/L时阳极的氧化成膜和析氧反应最为有利。     

Effects of processing technology on the electrochemical behavior and Zn deposition process of Al-Mn-Ca alloy cathodes in high Cl− ions ZnSO4 solutions

Journal of Solid State Electrochemistry - In this paper, Al-Mn-Ca alloys were processed and made into cathodes with different heat treatment temperatures and rolling deformations. The physical and...     

氯离子浓度对锌电积用铝基铅合金复合β-PbO2颗粒阳极行为的影响

在酸性硫酸锌体系中研究了不同氯离子含量对Al/Pb-0.3%Ag-0.06%Ca复合β-PbO₂颗粒阳极行为的影响, 并通过X射线衍射(XRD)以及扫描电子显微镜(SEM)等技术手段来表征阳极的特征。 结果表明, 随着氯离子含量的增加, 阳极的析氧过电位逐渐增大;阻抗呈逐渐增大的趋势;阳极表面膜β-PbO₂和α-PbO₂衍射峰强度整体呈现出减弱的趋势;阳极氧化膜上的枝状晶簇消失;腐蚀速率逐渐增大。 当氯离子含量为300 mg/L时, 阳极具有最大的表观电流密度i₀, 表现出了最好的电化学性能以及耐腐蚀性。     

Investigation of high current density on zinc electrodeposition and anodic corrosion in zinc electrowinning

Journal of Solid State Electrochemistry - In this work, the effects of high current density (500 A/m2, 600 A/m2, 700 A/m2, 800 A/m2) on zinc electrodeposition as well as the anodic corrosion...